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Prerequisites Requirements There are no specific requirements for this document. Watch headings for an "edit" link when available. Solution The solution(s) to this problem are explained in these detail. I found many, but none has the same quality of NetworkLessons.com.

Rtr-A receives BGP routes announced by Rtr-B and tries to install the 20.20.20.20/32. The router detects that this nondirectly-connected route 20.20.20.20/32 has a recursive routing failure and withdraws 20.20.20.20/32 from the routing table. I did not see any error. Reply Valter December 22, 2015 Dmitry, Just wanted to let you know that I corrected the article after you drew my attention to some errors inside.

Join Now For immediate help use Live now! March 21, 2014 at 23:01 #13718 Rene MolenaarKeymaster If you increase the metric on the tunnel interface then it will solve your problem since the path through the fastethernet interfaces Do not advertise the tunnel destination into the routing protocol From design perspective, especially when deploying the tunnels over a private WAN, it's desired to split the addressing so that WAN I found Networklessons.com very comprehensible and valuable!

Thanks Rene, for all the hard work you have done to create this excellent networking lessons website! If that is true, packet will be forwarded using the Layer 2 described in the question No2 below. http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/22327-gre-flap.html. The tunnel now collapses…because we are trying to reach the tunnel destination through the tunnel itself.

In this particular situation, Rtr-A learns a route to the nondirectly-connected network 20.20.20.20/32 with a nondirectly-connected next hop of 20.20.20.20 (itself). Technologies that he is mostly interested in are routing and switching, virtualization, data center, and a little bit of network security. Makara NGY IT Manager Great Troubleshooting Resource I cannot be more grateful to have found NetworkLessons.com to prepare for my CCIE journal. Because the longest matching route is preferred, 20.20.20.20/32 is preferred over 20.20.20.0/24.

When router finds longest match route for wanted destination, the next-hop value for this prefix is read and checked. but i'd off adding both the phys interface and the tunnel in my routing protocol and adjust the cost (higher) on the tunnel interface to deal with the issues. OSPF has a lower (better) administrative distance than RIP, so the RIP entries will be removed and the OSPF entries will be installed…and the tunnel collapses. Common symptoms of recursive routing failure in BGP are: Constant deletion and reinsertion of BGP routes into the routing table.

It does not add any routing performance. Process used by router R1 in the example above is called recursive lookup because router needed to go across the routing table twice in order to find the out interface. Make sure the metric to the tunnel destination IP address through the tunnel is worse than what you have in the routing table now. CEF will recalculate outgoing interface/next-hop anyways. "We can probably state that recursive routing when it happens, is basically a mistake in our routing table." No, the first example that comes to

If you add default route again, recursive error will happen again. 0 Message Active today Author Comment by:leblanc2014-05-19 Hmmm... Then everything comes into light. It is fantastic that a person is so dedicated to help others on difficult topics. RTR-A#show ip route 172.16.1.0 Routing entry for 172.16.1.0/24 Known via "bgp 1", distance 20, metric 0 Tag 2, type external Last update from 20.20.20.20 00:00:16 ago Routing Descriptor Blocks: * 20.20.20.20,

This error message will keep flooding your router until someone fixes the misconfiguration of the router. The same problem will occur if you configure OSPF on the tunnel and advertise the tunnel destination IP addresses in OSPF. You need to make sure that the router doesn't reach the tunnel destination through the tunnel itself. I spent many hours troubleshooting but I don't see any solution.

Thanks for the link. After activating RIP on the tunnel interface, R1 and R3 learn that they can reach each others loopback interface with a hop count of 1. Your network diagrams are really beautiful. Complete courses.

Before the tunnel is established: Remote-Router#sh ip cef 155.1.1.1 0.0.0.0/0, version 7, epoch 0, cached adjacency to Serial0/0 0 packets, 0 bytes via 155.2.2.1, 0 dependencies, recursive next hop 155.2.2.1, Serial0/0 router bgp bgp dampening The bgp dampening commandsets default values for the dampening parameters such as Halftime= 15 minutes, reuse = 750, Suppress = 2000 and Max Suppress Time= Now your router will have two entries in the routing table, one from EIGRP (2.0.0.0 /8), and one for BGP (2.2.2.0 /24). This is done in order to avoid route flapping and routing loops.

Since 1 is a better metric than 2, they remove their entry from the routing table that points to R2 and insert an entry that points to the tunnel interface. Problem Symptoms These two symptoms are observed with recursive routing failure: The continuous flapping of BGP-learned routes in the IP routing table. Now let's create a tunnel interface between the loopback interfaces of R1 and R3: R1(config)#interface tunnel 1 R1(config-if)#tunnel source loopback0 R1(config-if)#ip address 192.168.13.1 255.255.255.0 R1(config-if)#tunnel destination 3.3.3.3 R3(config)#interface tunnel 1 R3(config-if)#tunnel Sending 5, 100-byte ICMP Echos to 222.222.222.222, timeout is 2 seconds: .....

If that is not the case, Router needs to make a route lookup on his routing table in order to find the longest match for this IP address subnet. Sat, 10/26/2013 - 11:46 Hello.The issue is: you are using auto-summary under EIGRP rocess; solution - use "no auto-summary" PS: the error says that route to neighbor was learnt over BGP Rafael Neves Network Engineer Disclaimer Privacy Policy Support GRE Tunnel Recursive Routing Error written by Rene Molenaar average rating 4.3/5 - 13 user ratings © 2013 - 2016 NetworkLessons.com Get Full After that the questions for him to solve are these: Is maybe the destination IP address chunk of one of the local subnets that this router has on one of his

I configured network 192.168.13.0 /24 on the tunnel interface.